Layered transition metal oxides have emerged as promising candidates for potassium-ion (KIB) and sodium-ion (NIB) battery cathodes due to their high theoretical capacities, suitable working potentials, and scalable synthesis routes. However, challenges such as structural degradation, sluggish ion kinetics, and high material cost hinder their practical application. This study presents a low-cost, environmentally benign, and structurally stable P3-type layered oxide, K₀.₄Fe₀.₁Mn₀.₈Ti₀.₁O₂, designed through strategic doping with abundant and non-toxic elements—iron and titanium. The material exhibits exceptional electrochemical performance for both potassium and sodium storage. In potassium half-cells, it delivers a reversible capacity of 117 mA h g⁻¹ at 20 mA g⁻¹ and maintains 71 mA h g⁻¹ even at 1000 mA g⁻¹, demonstrating outstanding rate capability. In situ X-ray diffraction confirms a solid-solution reaction mechanism with negligible volume change (only 0.5%), indicating true zero-strain behavior during cycling. This structural stability ensures excellent long-term cycling performance, retaining 74% capacity after 300 cycles at 200 mA g⁻¹. When applied in sodium-ion batteries, the material undergoes spontaneous ion exchange with Na⁺-containing electrolytes, forming K₀.PRKAA1 Antibody Formula ₁₂Na₀.HRAS Antibody Epigenetic Reader Domain ₂₈Fe₀.PMID:33863856 ₁Mn₀.₈Ti₀.₁O₂. The residual K⁺ ions act as structural pillars, stabilizing the layered framework and expanding interlayer spacing, which facilitates fast Na⁺ diffusion. As a result, the modified electrode achieves a high reversible sodium storage capacity of 160 mA h g⁻¹ and retains 81% of its initial capacity after 300 cycles. Moreover, the Na⁺ diffusion coefficient is enhanced to 10⁻¹¹–10⁻⁹ cm² s⁻¹, confirming improved ionic kinetics. These findings highlight the dual functionality of the material and provide a new design strategy for developing high-performance, low-cost cathodes for next-generation energy storage systems.MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com
